CN113659739A - Novel modular motor stator - Google Patents

Novel modular motor stator Download PDF

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Publication number
CN113659739A
CN113659739A CN202110945950.1A CN202110945950A CN113659739A CN 113659739 A CN113659739 A CN 113659739A CN 202110945950 A CN202110945950 A CN 202110945950A CN 113659739 A CN113659739 A CN 113659739A
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teeth
stator
redundant
motor
effective
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CN113659739B (en
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李焱鑫
卢琴芬
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Zhejiang University ZJU
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Zhejiang University ZJU
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/14—Stator cores with salient poles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
    • H02K1/187—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures to inner stators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2786—Outer rotors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

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  • Power Engineering (AREA)
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Abstract

The invention discloses a novel modular motor stator which is formed by splicing identical modules in the circumferential direction through partial redundant teeth respectively positioned at two ends of the modules, wherein each module is formed by a plurality of basic module units, and the two ends of the modules in the circumferential direction comprise partial redundant teeth. After partial redundant teeth of adjacent modules are spliced, a complete redundant tooth is formed, and no coil is wound on the complete redundant tooth; each basic module unit comprises a plurality of effective teeth and partial redundant teeth positioned at two ends in the circumferential direction; the number of all redundant teeth contained in the whole stator is integral multiple of the number of phases of the motor, the number of coils contained in the whole stator is equal to the total number of effective teeth, and the total number of teeth is equal to the sum of the number of all the redundant teeth and the number of the effective teeth. The novel motor stator disclosed by the invention is easy to realize modular processing, the material waste is less, and the applied motor can be ensured to be large and stable in output through reasonable coil connection and mechanical installation according to the design method, so that the novel motor stator can be widely applied to various related products.

Description

Novel modular motor stator
Technical Field
The invention belongs to the technical field of motor design, and particularly relates to a novel modular motor stator.
Background
The electric motor has an extremely wide application as a device for realizing interconversion between electric energy and mechanical energy, and most of electric energy is generated and consumed by the electric motor, so that high efficiency, high reliability and high power density are the main pursuits of the electric motor. Since the processing of the motor inevitably involves handling of the material, it is important to efficiently process the material. For a small motor, a motor stator can be integrally machined and formed in a stamping mode, a linear cutting mode and the like, but with the increase of the volume of the motor, the waste of materials is more serious when the stator is integrally machined, and when the volume is increased to a certain degree, the stator is difficult to integrally machine, and a modular structure such as a large-scale water turbine, a direct-drive wind driven generator and the like is required. In addition, the motor efficiency is also the main development direction of the motor by reducing the loss of the motor, and the length of an invalid end part in the motor can be greatly reduced by adopting a non-overlapping winding structure at the end part, so that the copper consumption of a stator is reduced, and the motor efficiency is improved; the winding structure can also reduce the torque pulsation of the motor, and is easy to realize the processing by taking a single tooth as a minimum module. Therefore, it is practical how to easily realize modularization under the condition of adopting end non-overlapping windings, ensure that both ends of each module in the circumferential direction have redundant teeth to provide protection, and do not cause the deterioration of the performance of the motor.
The inventors of the present application proposed a Novel modular structure during bosch to realize a structure in which end non-overlapping windings are combined with redundant teeth to constitute a stator core module, and introduced the overlapping structure of the end non-overlapping windings and redundant teeth in documents y.x.li, z.q.zhu, a.s.thomas, z.y.wu, and x.m.wu, "Novel modular fractional stator coils with redundant slots," IEEE trans.magn., vol., No. 55, No.9, pp.1-10, sep.2019] and documents y.x.li, z.q.zhu, and a.s.thomas, "Generic slot and pole numbers binding for non-modular coils with redundant slots," sep. emitter coils with redundant slots, "sep. 3-se coils with redundant slots," IEEE # 3, pp.6, 1676, and IEEE # 1676. wo 19. vol., and "detailed structural analysis of overlapping windings and redundant slots with redundant slots, and" sep.x.x.li, z.q.zhu, and "sep.s.s.s.s.thomas" sep. However, long-term research shows that the structure also has the following problems: although the symmetrical and balanced double three-phase no-load electromotive force can be obtained, the magnetomotive force of the two sets of windings is not symmetrical, which means that the load end voltage of the windings is asymmetrical; the asymmetric armature magnetomotive force can correspondingly generate richer harmonic waves, which can increase the eddy current loss induced on the rotor, particularly the iron yoke part of the solid rotor which has high conductivity and no partition; in addition, each module in the structure comprises complete double three-phase windings, although the two windings are respectively supplied with power by an independent three-phase system, the two windings of the whole motor are in physical contact, complete decoupling is not realized, only physical isolation is realized among the stator modules, and the fault-tolerant capability of the motor is not improved.
In conclusion, the modular structure has high research and application values in the motor, and in the field of wind power generation, the processing of the stator of the large permanent magnet direct-drive motor inevitably adopts a modular technology; the end overlapping type winding structure is mainly used in the existing products, and numerous large-scale wind power enterprises are researched and developed towards the end non-overlapping type winding structure. At present, no related effective multiphase high fault-tolerant modular structure exists, and the modules of the traditional full-tooth winding end non-overlapping winding are in physical contact, so that coils at two ends of the modules are easy to damage, the module strength is low, and the fault-tolerant capability is not high. Due to the problems and the requirement for the modular direct-drive permanent magnet motor, the modular motor stator has practical research significance.
Disclosure of Invention
In view of the above, the invention provides a novel modular motor stator, which can solve the problem that redundant teeth are difficult to introduce in the conventional modular motor to provide protection for coils at two ends of the circumference of a module.
A novel modular motor stator is formed by splicing N identical stator modules in the circumferential direction, each stator module is formed by M basic module units, each basic module unit comprises a plurality of effective teeth and partial redundant teeth positioned at two circumferential ends, and two adjacent basic module units in the stator modules are spliced by the partial redundant teeth; two adjacent stator modules form a complete redundant tooth after being spliced through partial redundant teeth at the circumferential end part, the redundant tooth is not wound with a coil, the effective tooth is wound with a coil, and both N and M are positive integers.
Further, the number of complete redundant teeth contained in the whole stator is positive integral multiple of the number of motor phases, the number of coils contained in the whole stator is equal to the total number of effective teeth, and the number of the effective teeth is positive integral.
Further, the number of teeth of the whole stator is the sum of the numbers of all the complete redundant teeth and the effective teeth, and the number of slots of the whole stator is equal to the number of teeth.
Furthermore, the material adopted by the whole stator can be various magnetic conductive materials such as silicon steel, cobalt steel, nickel steel, soft iron composite, non-gold alloy, permalloy and the like.
The whole stator is formed by splicing a plurality of stator modules, each stator module is a part in the circumferential direction, and the number of the modules is any integer.
Each stator module at least comprises one basic module unit, the total number of the modules is the maximum number of the basic module units, two ends of each module along the circumferential direction must be formed by partial redundant teeth, the modules are formed by splicing partial redundant teeth at respective connecting positions, and the two partial redundant teeth are spliced into a complete redundant tooth.
Each basic module unit must contain an effective tooth, on which a coil must be wound, and two partially redundant teeth at the ends in the circumferential direction, the number of effective teeth must be a positive integer.
Further, the stator may be an inner stator structure, an outer stator structure, or a disc structure, and the like, and the arrangement of the tooth groove structure of the stator in the circumferential direction must satisfy the above requirements.
Further, the relevant parameters of the stator need to satisfy the following conditions:
Figure BDA0003214913850000031
Figure BDA0003214913850000032
Figure BDA0003214913850000033
Nte0*de＝2*(p0-pr)*dp
Figure BDA0003214913850000034
Figure BDA0003214913850000035
wherein: n is a radical ofteAnd NtrEffective and redundant teeth number in the stator, NeEffective number of teeth contained in the basic module unit, NtIs the total number of teeth of the stator and Nt＝Nte+NtrP is the number of pole pairs of the rotor, t is NtGreatest common divisor of p, Nt0And p0The number of stator teeth and the number of pole pairs of the minimum repeated unit of the motor are respectively, k is a positive integer, m is the phase number of the motor, and N iste0And Ntr0Effective number of teeth and redundant number of teeth, p, respectively, included in the minimal repeating unit of the motorrIs a given positive integer, deIs the spacing of the centre lines of adjacent effective teeth, dpIs the rotor pole pitch, drThe distance between the boundary of partial redundant teeth at the end part of the motor minimum repeating unit along the circumferential direction and the center line of the effective teeth which are close to the inside is provided.
The minimum repeating unit of the motor is a motor component, which comprises a plurality of stator modules and meets the following conditions:
Figure BDA0003214913850000041
wherein: n is a radical oftIs the total number of teeth of the stator and Nt＝Nte+Ntr。
The novel motor stator structure provided by the invention is easy to realize modular processing, has less material waste, and can ensure that the applied motor has large and stable output through reasonable coil connection and mechanical installation according to the design method, so that the novel motor stator structure can be widely applied to various related products.
Drawings
Fig. 1(a) is a three-dimensional schematic diagram of the stator structure of the novel modular motor of the present invention.
Fig. 1(b) is a two-dimensional schematic diagram of the stator structure of the novel modular motor of the present invention.
Fig. 2 is a schematic structural diagram of an outer stator of the novel modular motor stator of the invention.
Fig. 3 is a schematic diagram of a disk structure of the novel modular motor stator of the invention.
Fig. 4 is a structural diagram of a stator with 5 or 10 phases of a motor and an effective tooth number of 1 in a basic module unit.
Fig. 5 is a schematic view of a stator structure in which the number of effective teeth in the basic module unit is 3 and the motor is 3 or 9 phases.
In the figure: (1) -axial direction, (2) -circumferential direction, (3) -main view direction, (4) -stator module, (5) -basic module unit, (6) -rotor core, (7) -permanent magnet, (8) -coil, (9) -effective teeth, (10) -partial redundant teeth at one end of module, (11) -partial redundant teeth at the other end of module, (12) -partial redundant teeth at one end of basic module unit, (13) -partial redundant teeth at the other end of basic module unit, (14) -one end of basic module unit is spliced to form a complete redundant tooth, (15) -one end of basic module unit is spliced to form a complete redundant tooth, and (16) -two adjacent basic module units inside module are spliced to form a complete redundant tooth.
Detailed Description
In order to more specifically describe the present invention, the following detailed description is provided for the technical solution of the present invention with reference to the accompanying drawings and the specific embodiments.
In the present embodiment, the motor shown in fig. 1(a) has a radially inner stator structure, and the motor rotor has a single rotational degree of freedom, that is, can rotate only about the positive axial direction (1). When the direction shown in fig. 1(a) is selected as the positive axial direction, the positive circumferential direction (2) is defined as the counterclockwise direction with respect to the positive axial direction, and the purpose of defining the positive circumferential direction is to facilitate the following description of the motor structure. An axial section of the motor is selected along the front view direction (3) of the negative axial direction for projection, and the section shown in fig. 1(b) can be obtained.
The three-dimensional view of fig. 1(a) of this embodiment, in addition to showing the stator, also comprises a rotor with N and S alternately magnetized permanent magnets (7), with one N and S forming a pair of poles, the motor in this example comprising 11 facing poles, the permanent magnets being arranged in a face-to-face manner on the rotor core (6). It should be emphasized that the present invention is not limited to the structure of the rotor, the structure of the rotor in fig. 1(a) is only used as an example for illustrating the details of the present invention, and the main technical features of the present invention are the proposed stator structure.
The present invention can more clearly illustrate the details of the implementation based on the three-dimensional schematic diagram illustrated in fig. 1(a) and the two-dimensional cross-sectional diagram illustrated in fig. 1(b), wherein the definitions in the two-dimensional diagram and the definitions in the three-dimensional diagram have a one-to-one correspondence relationship. The whole stator is composed of basic module units (5) with the same structure, the basic module units contain 2 teeth wound with coils (8), namely effective teeth (9), and no end overlapping exists between the coils. The two ends of the basic module unit along the positive circumferential direction (2) are composed of partial redundant teeth (12) and (13), the teeth do not wind coils and only play a role of dividing the coils at the two ends of the module and protecting the module, and the teeth are called redundant teeth for this reason. Because the complete stator or a stator module is formed by basic module units, the complete redundant teeth (14) and (15) are formed after two adjacent basic module units are spliced, and the redundant teeth at two ends of the basic module units are called partial redundant teeth for this purpose. The number of the basic module units determines the total number of the redundant teeth of the stator, and the actual processing module number of the stator is not necessarily equal to the number of the basic module units; if the number of basic module units is Nbm and the number of actual stator processing modules is Nsm, Nbm/Nsm is an integer. Thus, in an actual stator module, as shown in the example of fig. 1(a), the whole stator is composed of two identical stator modules (4), each module contains 6 basic module units, and both ends of each stator module in the positive circumferential direction (2) also contain partial redundant teeth (10) and (11) provided by the basic module units for module splicing. The complete redundant teeth (16) formed by splicing the basic units in the modules are directly processed during processing without splicing the basic module units, the widths of the effective teeth and the redundant teeth can be different, and specific numerical values can be obtained through optimization analysis. The embodiment has low processing difficulty and less material waste, can obtain satisfactory results by properly selecting parameters, and is very suitable for being applied to various permanent magnet motors.
The invention is most particularly applicable to the point that the redundant teeth in the stator are not simply added to the structure that originally did not include the redundant teeth to obtain a modular stator. The modular stator design method of the present invention requires a series of constraints to be satisfied, and it is these constraints that make the present invention different from other stator structures and thus will be used in the stator structure of the present invention. Still specifically based on the example of fig. 1(a), the number of effective teeth wound with coils is defined as Nte, which is 24 in this example; the number of all redundant teeth not wound with coils is defined as Ntr, which is 12 in this example; the total number of stator teeth is defined as Nt ═ Nte + Ntr, in this example 36; the number of rotor pole pairs is defined as p, which is 11 in this example; the number of motor phases is defined as m, which in this example is 6. To construct the modular stator structure of the present invention, the above parameters need to satisfy the following conditions:
the minimum repeating unit of the motor, which is composed of the number of teeth and the number of pole pairs of the stator of the motor and has Nt0 stator teeth and p0 opposite poles, can form a symmetrical m-phase motor. In this example, t is 1, Nt0 is 36, p0 is 11, Nt0/m is 6, and p0/m is 11/6 which is not an integer, and the following formulas (1) to (4) are satisfied:
Figure BDA0003214913850000061
t is the greatest common divisor (N)t，p) (2)
Figure BDA0003214913850000062
Figure BDA0003214913850000063
Effective teeth Nte0 and redundant teeth Ntr0 contained in the minimum repeating unit of the motor need to meet the symmetry condition of the m-phase motor; in this example, Nte0 is 24, Nte0/m is 4, Ntr0 is 12, Ntr0/m is 2, and the following conditions (5) to (6) are satisfied:
Figure BDA0003214913850000064
Figure BDA0003214913850000065
the coil span yc is 1, which meets the requirement of effective teeth and pole pairs; in this example, pr ═ 1 and Nte0/(2 × (p0-pr)) ═ 1.2 satisfy the conditions represented by the following formula (7):
Figure BDA0003214913850000066
the effective tooth number Ne contained in the basic module unit can be any integer; ne ═ 2 in this example, satisfies the conditions shown by the following formula (8):
Ne＝k，k＝1，2，3... (8)
when the effective teeth Nte0 contained in the minimum repeating unit of the motor and the pole pair number meet a special relation, the stator structure provided by the invention can also be formed; in a different example from the present example, if Nte0 ═ 24, p0 ═ 13, pr ═ 1, Nte0/(2 × (p0-pr)) -1, the condition shown in the following formula (9) is satisfied:
Figure BDA0003214913850000071
when the effective teeth included in the minimum repeating unit of the motor are larger than 1, the distance de between the center lines of the effective teeth and the rotor pole pitch dp need to satisfy the conditions shown in the following formulas (10) to (12):
Nte0*de＝2*(p0-pr)*dp，pr＝1，2，3... (10)
Figure BDA0003214913850000072
Figure BDA0003214913850000073
seventhly, the distance dr between the boundaries of partial redundant teeth at two ends of the minimum repeating unit of the motor in the positive circumferential direction and the centers of the adjacent effective teeth needs to satisfy the condition shown in the following formula (13):
Figure BDA0003214913850000074
the present example is for illustration only, and the modular stator of the present invention can be constructed as long as the above-mentioned relationship is satisfied, and the stator structure may be an inner stator type in the present invention, an outer stator type and a disc type as well, as shown in fig. 2 and 3, respectively. The number of phases m in the stator of the present invention is not particularly limited, and fig. 1(a) illustrates 6 phases, and the motor windings shown in fig. 1(a) may be connected in 3 or 12 phases. Fig. 4 and 5 show two other embodiments, the stator motor of fig. 4 can be constructed with 5 or 10 phases, and the number of effective teeth in the minimum module unit is 1; the stator motor of fig. 5 can then constitute 3 or 9 phases, with an effective number of teeth in the smallest modular unit of 3.
The foregoing description of the embodiments is provided to enable one of ordinary skill in the art to make and use the invention, and it is to be understood that other modifications of the embodiments, and the generic principles defined herein may be applied to other embodiments without the use of inventive faculty, as will be readily apparent to those skilled in the art. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications to the present invention based on the disclosure of the present invention within the protection scope of the present invention.

Claims (8)

1. A novel modularization motor stator which characterized in that: the stator is formed by splicing N identical stator modules in the circumferential direction, each stator module is formed by M basic module units, each basic module unit comprises a plurality of effective teeth and partial redundant teeth positioned at two circumferential ends, and two adjacent basic module units in the stator modules are spliced by the partial redundant teeth; two adjacent stator modules form a complete redundant tooth after being spliced through partial redundant teeth at the circumferential end part, the redundant tooth is not wound with a coil, the effective tooth is wound with a coil, and both N and M are positive integers.
2. The novel modular motor stator of claim 1, wherein: the number of complete redundant teeth contained in the whole stator is positive integral multiple of the number of phases of the motor, the number of coils contained in the whole stator is equal to the total number of effective teeth, and the number of the effective teeth is positive integral.
3. The novel modular motor stator of claim 1, wherein: the number of teeth of the whole stator is the sum of the numbers of all complete redundant teeth and effective teeth, and the number of slots of the whole stator is equal to the number of teeth.
4. The novel modular motor stator of claim 1, wherein: the material used by the whole stator can be various magnetic conductive materials including silicon steel, cobalt steel, nickel steel, soft iron compound, non-gold alloy and permalloy.
5. The novel modular motor stator of claim 1, wherein: each stator module at least comprises one basic module unit, the total number of the modules is the maximum number of the basic module units, two ends of each module along the circumferential direction must be formed by partial redundant teeth, the modules are formed by splicing partial redundant teeth at respective connecting positions, and the two partial redundant teeth are spliced into a complete redundant tooth.
6. The novel modular motor stator of claim 1, wherein: the relevant parameters of the stator need to satisfy the following conditions:
Figure FDA0003214913840000011
Figure FDA0003214913840000012
Figure FDA0003214913840000013
Nte0*de＝2*(p0-pr)*dp
Figure FDA0003214913840000021
Figure FDA0003214913840000022
wherein: n is a radical ofteAnd NtrEffective and redundant teeth number in the stator, NeEffective number of teeth contained in the basic module unit, NtIs the total number of teeth of the stator and Nt＝Nte+NtrP is the number of pole pairs of the rotor, t is NtGreatest common divisor of p, Nt0And p0The number of the stator teeth and the number of the pole pairs of the minimum repeating unit of the motor are respectively, k is a positive integer, and m is the motorNumber of phases, Nte0And Ntr0Effective number of teeth and redundant number of teeth, p, respectively, included in the minimal repeating unit of the motorrIs a given positive integer, deIs the spacing of the centre lines of adjacent effective teeth, dpIs the rotor pole pitch, drThe distance between the boundary of partial redundant teeth at the end part of the motor minimum repeating unit along the circumferential direction and the center line of the effective teeth which are close to the inside is provided.
7. The novel modular motor stator of claim 6, wherein: the minimum repeating unit of the motor is a motor component, which comprises a plurality of stator modules and meets the following conditions:
Figure FDA0003214913840000023
wherein: n is a radical oftIs the total number of teeth of the stator and Nt＝Nte+Ntr。
8. The novel modular motor stator of claim 1, wherein: the stator can be an inner stator structure, an outer stator structure or a disc structure, and the arrangement of the tooth groove structure of the stator in the circumferential direction must meet the requirements.
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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013124239A2 (en) * 2012-02-22 2013-08-29 Siemens Aktiengesellschaft Dynamoelectric machine with a single-layer fractional-slot winding
CN103683564A (en) * 2013-06-26 2014-03-26 南京信息工程大学 Double-winding modular bearingless magnetic flux switching permanent magnet motor
CN104319917A (en) * 2014-10-30 2015-01-28 东南大学 Redundant half-tooth-winding magnetic flux switching motor
CN107070016A (en) * 2017-04-18 2017-08-18 苏州汇川联合动力系统有限公司 Double remaining stators and double remaining motors
CN109494895A (en) * 2018-12-24 2019-03-19 浙江大学 A kind of Modular motor stator
CN110337772A (en) * 2017-02-02 2019-10-15 西门子歌美飒可再生能源公司 segmented stator motor
CN110556931A (en) * 2019-09-24 2019-12-10 哈尔滨工业大学 Modularized multi-phase alternating current fault-tolerant motor

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013124239A2 (en) * 2012-02-22 2013-08-29 Siemens Aktiengesellschaft Dynamoelectric machine with a single-layer fractional-slot winding
CN103683564A (en) * 2013-06-26 2014-03-26 南京信息工程大学 Double-winding modular bearingless magnetic flux switching permanent magnet motor
CN104319917A (en) * 2014-10-30 2015-01-28 东南大学 Redundant half-tooth-winding magnetic flux switching motor
CN110337772A (en) * 2017-02-02 2019-10-15 西门子歌美飒可再生能源公司 segmented stator motor
CN107070016A (en) * 2017-04-18 2017-08-18 苏州汇川联合动力系统有限公司 Double remaining stators and double remaining motors
CN109494895A (en) * 2018-12-24 2019-03-19 浙江大学 A kind of Modular motor stator
CN110556931A (en) * 2019-09-24 2019-12-10 哈尔滨工业大学 Modularized multi-phase alternating current fault-tolerant motor

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